A climate-neutral heat supply by 2040: That is the goal behind the Climate Protection Act of the state of Baden-Württemberg. It obliges cities with 20,000 or more inhabitants to draw up a municipal heating plan by the end of 2023 and to implement the first five measures within five years. Even before the legal obligation, Rastatt's municipal council adopted the goal of making Rastatt climate-neutral by 2035 and also commissioned a heating plan for this purpose.
At an information event in the BadnerHalle on June 28, the engineering firm EGSplan commissioned by the city presented the interim status of the municipal heating plan, which must be updated every seven years. In addition, Stadtwerke Rastatt outlined ideas for the further expansion of the district heating network in Rastatt.
What are the general goals of a climate-neutral heat supply?
How is heating currently used in Rastatt's households?
In recent months, the city of Rastatt, together with the engineering firm EGSplan, has surveyed 20,750 buildings to determine how they are currently heated and how high their consumption is. The result: 96 percent of the heat demand is provided by fossil fuels, especially natural gas. Energy demand is highest in the industrial sector, followed by residential use.
Which potentials does the engineering office see in Rastatt to cover the energy demand by renewable energies?
Municipal heat planning is limited to changing energy consumption in public buildings and private households. The industrial sector is subject to its own legal rules.
As part of the municipal heating plan, an investigation was carried out to determine which areas would be suitable for which form of climate-neutral energy supply. The interim result is already clear: Most of Rastatt would be suitable for district heating.
According to the EGS analysis, the district heating network in Rastatt has a lot of potential. How far along is Rastatt in its expansion?
Compared to other municipalities, Rastatt is well advanced in the expansion of its district heating network. According to Stadtwerke Rastatt, almost 30 kilometers of pipes have been laid and around 1,400 households are connected to them. Currently, a pipeline approximately 1,100 meters long is being laid along Herrenstrasse and Lyzeumstrasse. Information on the expansion of the district heating network. Stadtwerke Rastatt plans to expand the district heating network in the coming years. This makes particular sense in areas where a lot of heat is needed, such as a hospital.
What alternative is there for homeowners who are too far from district heating lines?
Which five measures must Rastatt implement in the next five years?
The core of the package of measures is to drive forward the expansion of the district heating network in Rastatt. Four of the five measures focus on this.
1. Feasibility study heating network Münchfeld Hospital
It is being examined where and in what size possible heating centers could be built around the planned Münchfeld Clinic. In the course of this, it is also being investigated which streets could be equipped with a district heating network and which buildings could be connected to the network.
2. Transformation study Friedrichring heating network
The aim of this measure is to expand the existing network. Here, too, it is to be examined which buildings can be connected to the district heating network and how the pipeline can be routed. This is to be accompanied by a transformation study towards green heat.
3. Feasibility study heat network Rheinau
In addition to checking which buildings can be connected to the district heating network, this measure will examine in greater detail the potential of wastewater from the sewage treatment plant as an energy source. This will be accompanied by an investigation of the area in which a district heating capacity can run between the Rheinau supply area and the sewage treatment plant.
4. Transformation study heating network Rastatt-Mitte
The highest potential for expansion of the district heating network is offered by the city center. Nevertheless, the feasibility study will examine which streets and buildings can be connected and the associated costs.
5. Feasibility study for the use of deep geothermal energy
Due to the local geology, experts assume that there is a high thermal potential in Rastatt for green heat supply. However, in view of the complexity and regionality of the topic, the study is not being conducted on a municipal basis, but with other municipalities, associations and energy suppliers.